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Retirement Plans and Other Retiree Benefits - Summary of Net Periodic Benefit Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Retiree Benefit Plans      
Components of Net Periodic Benefit Cost      
Service cost $ 13 $ 13 $ 14
Interest cost 40 43 44
Annual ESOP allocation 0 0 0
Expected return on plan assets 0 (1) (2)
Amortization of transition and prior service costs (credits) 0 0 0
Amortization of actuarial loss 13 14 25
Net periodic benefit cost 66 69 81
Other postretirement charges (3) 1 1
Total pension cost $ 63 $ 70 $ 82
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost      
Discount rate 4.41% 4.97% 4.36%
Long-term rate of return on plan assets 6.80% 6.80% 6.80%
Long-term rate of compensation increase 0.00% 0.00% 0.00%
ESOP growth rate 10.00% 10.00% 10.00%
Medical cost trend rate of increase 6.33% 6.67% 7.00%
United States | Pension Plans      
Components of Net Periodic Benefit Cost      
Service cost $ 1 $ 1 $ 2
Interest cost 94 105 100
Annual ESOP allocation 0 0 0
Expected return on plan assets (111) (109) (117)
Amortization of transition and prior service costs (credits) 0 0 0
Amortization of actuarial loss 48 41 44
Net periodic benefit cost 32 38 29
Other postretirement charges 24 3 16
Total pension cost $ 56 $ 41 $ 45
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost      
Discount rate 4.27% 4.93% 4.24%
Long-term rate of return on plan assets 6.80% 6.80% 6.80%
Long-term rate of compensation increase 3.50% 3.50% 3.50%
ESOP growth rate 0.00% 0.00% 0.00%
Medical cost trend rate of increase 0.00% 0.00% 0.00%
Defined Benefit Plan Disclosure, Additional Information [Abstract]      
Voluntary contributions to postretirement plans $ 81 $ 53 $ 0
International | Pension Plans      
Components of Net Periodic Benefit Cost      
Service cost 16 16 20
Interest cost 22 25 28
Annual ESOP allocation 0 0 0
Expected return on plan assets (22) (23) (28)
Amortization of transition and prior service costs (credits) 0 0 2
Amortization of actuarial loss 10 8 11
Net periodic benefit cost 26 26 33
Other postretirement charges 4 11 (1)
Total pension cost $ 30 $ 37 $ 32
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost      
Discount rate 2.59% 3.17% 3.06%
Long-term rate of return on plan assets 4.14% 4.62% 5.05%
Long-term rate of compensation increase 2.58% 2.78% 2.83%
ESOP growth rate 0.00% 0.00% 0.00%
Medical cost trend rate of increase 0.00% 0.00% 0.00%
Global Growth and Efficiency Program      
Defined Benefit Plan Disclosure, Additional Information [Abstract]      
Charges against assets $ (40) $ (33) $ (42)
Global Growth and Efficiency Program | Employee-Related Costs      
Defined Benefit Plan Disclosure, Additional Information [Abstract]      
Charges against assets $ (21) $ (4) $ (17)